Disclosed is a method for using various multiple antenna schemes in a
baseband wireless access system is provided. According to the method, a
downlink MAP message is constructed in order to support various multiple
antenna schemes based on a multiple-input multiple output (MIMO), which
is one of the multiple antenna schemes, so that compatibility with
exiting MIMO technology having no MIMO feedback can be achieved and
overhead occurring in transmission of an MAP information element can be
reduced. Further, it is possible to efficiently support spatial
multiplexing technology capable of transmitting multiple layers having
different modulation and coding in a MIMO system.